<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div>sdfsdf</div>
    <div>sdfsdf</div>
    <div>sdfsdf</div>
    <div>
        <div>
            <div id="1" style="position:fixed;top:0;right:0;">666</div>     <!--标签存在的意义 -->
            <div>77777</div>
        </div>
    </div>
</body>
</html>